Employee Benefit Plans Multiemployer Plan (Details) - USD ($) $ in Thousands	12 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
Multiemployer Plans [Line Items]
Entity Tax Identification Number	75-0948250
Multiemployer Plan, Contributions by Employer	$ 5,703	$ 6,278	$ 4,540
Boilermaker-Blacksmith National Pension Trust [Member]
Multiemployer Plans [Line Items]
Entity ID Number	EIN:48-6168020Plan: 001
Zone Status	Critical	Endangered
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan [Fixed List]	Implemented
Multiemployer Plan, Contributions by Employer	$ 5,337	$ 5,651	4,070
Multiemployer Plans, Surcharge [Fixed List]	Yes
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date	Various through 12/31/2020
Individually Insignificant Plans [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Contributions by Employer	$ 366	$ 627	$ 470

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- Definition

Entity ID Number

+ References

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Zone Status

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- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2

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- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

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-SubTopic 80
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-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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- Definition

Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA".

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA".

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
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-Paragraph 5
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